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    <h1> 标题1  </h1><h1> 标题1  </h1>
    <p>This is a paragraph. <span>This is a <a href="">老师</a> paragraph.</span> </p>
    <h2> 标题2 </h2>
    <H6> 标题6 </H6>
    <a href="http://cn.bing.com/?ref=go">超链接</a> <br>
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